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  <h1 class="title">简介</h1>
  <p class="para">
   The SNMP extension provides a very simple and easily usable toolset for
   managing remote devices via the Simple Network Management Protocol.
  </p>
  <p class="para">
   As it is a wrapper around the underlying Net-SNMP (or UCD-SNMP on older systems)
   library, all basic concepts are the same and the PHP functions change their
   behaviour depending on the Net-SNMP configuration files and environment variables.
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  <p class="para">
   Beginning with PHP 5.4, an OO API is available.
  </p>
  <p class="para">
   More information about Net-SNMP can be found at
   <a href="http://www.net-snmp.org/" class="link external">&raquo;&nbsp;http://www.net-snmp.org/</a>
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